(2) Each shikimic acid molecule consists of 7 carbon atoms, 10 hydrogen atoms and 5 oxygen atoms, so each shikimic acid molecule contains 22 atoms.
(3) The mass ratio of hydrogen and oxygen in shikimic acid is (/kloc-0 /×10): (16× 5) =1:8.
Therefore, the answer is: (1) organic matter; (2)22; (3) 1:8.